Hi iv just bought a a4 tdi 2000. It's the se so has a full display with engine check at top( orange) when the door is open the main computer lights up and shows which door is open but once the door is shut it goes black. Almost like it switches off. So I cant see mpg , trip distance ect. It only illuminates when the door is open. I know these are prone for failing but I'm lead to believe that's it's due to dead pixels normally , well the pixels are 100 % on this. When it lights up all the pixels are fine. Am I right in thinking there is a small bulb that could be at fault?